'use client'

import { useCallback, useEffect, useState } from 'react'

import Button from '@/components/formElements/Button'
import AdminState from '@/components/feedback/AdminState'
import ReviewCard from '@/components/reviews/ReviewCard'
import StatusChip from '@/components/ui/StatusChip'
import { getReviewStatus } from '@/constants/status'
import {
  EVENT_REVIEWS_PAGE_SIZE,
  LIST_ADMIN_EVENT_REVIEWS_PAGE,
  type AdminEventReview,
} from '@/services/reviews'
import { texts } from '@/texts'

interface EventReviewsPanelProps {
  eventId: string
}

const authorDisplayName = (review: AdminEventReview) => {
  const name = [review.user?.firstName, review.user?.lastName].filter(Boolean).join(' ').trim()

  return name || texts.events.guest
}

/** Read-only admin reviews for one event (includes hidden/deleted). */
const EventReviewsPanel = ({ eventId }: EventReviewsPanelProps) => {
  const [reviews, setReviews] = useState<AdminEventReview[]>([])
  const [isLoading, setIsLoading] = useState(true)
  const [isLoadingMore, setIsLoadingMore] = useState(false)
  const [page, setPage] = useState(1)
  const [totalItems, setTotalItems] = useState(0)

  const fetchPage = useCallback(
    async (nextPage: number, options?: { errorMode: 'silent' }) =>
      LIST_ADMIN_EVENT_REVIEWS_PAGE(eventId, nextPage, EVENT_REVIEWS_PAGE_SIZE, options),
    [eventId]
  )

  const load = useCallback(async () => {
    setIsLoading(true)
    const result = await fetchPage(1)

    if (result.ok) {
      setReviews(result.data.items)
      setTotalItems(result.data.totalItemsCount)
      setPage(1)
    }
    setIsLoading(false)
  }, [fetchPage])

  const loadMore = async () => {
    if (isLoadingMore || reviews.length >= totalItems) return
    setIsLoadingMore(true)
    const nextPage = page + 1
    const result = await fetchPage(nextPage, { errorMode: 'silent' })

    if (result.ok) {
      setReviews((current) => {
        const seen = new Set(current.map((review) => review.id))

        return [...current, ...result.data.items.filter((review) => !seen.has(review.id))]
      })
    }
    setPage(nextPage)
    setIsLoadingMore(false)
  }

  useEffect(() => {
    void load()
  }, [load])

  if (isLoading) {
    return <p className="mt-4 text-sm text-text-muted">{texts.reviews.loading}</p>
  }

  if (reviews.length === 0) {
    return (
      <div className="mt-4">
        <AdminState
          description={texts.reviews.hostEmptyDescription}
          title={texts.reviews.hostEmptyTitle}
          variant="empty"
        />
      </div>
    )
  }

  return (
    <div className="mt-4 space-y-3">
      <ul className="space-y-3">
        {reviews.map((review) => {
          const statusPresentation = getReviewStatus(review.status)

          return (
            <ReviewCard
              key={review.id}
              authorAvatarUrl={review.user?.avatarUrl}
              authorName={authorDisplayName(review)}
              authorUserId={review.user?.id}
              body={review.body ?? texts.reviews.ratingOnly}
              className="admin-surface space-y-2 p-4"
              createdAt={review.createdAt}
              footer={
                <div className="mt-3">
                  <StatusChip
                    chipColor={statusPresentation.chipColor}
                    label={statusPresentation.label}
                  />
                </div>
              }
              hostReplyBody={review.hostReplyBody}
              rating={review.rating}
              tone="organizer"
            />
          )
        })}
      </ul>

      {reviews.length < totalItems ? (
        <div className="flex justify-center">
          <Button
            isLoading={isLoadingMore}
            variant="flat"
            onClick={() => void loadMore()}
          >
            {texts.reviews.loadMore}
          </Button>
        </div>
      ) : null}
    </div>
  )
}

export default EventReviewsPanel